Wrench



ENTTED sTATEs PATENT oEEicE.

WILLIAM WARWICK, OF PITTSBURGH, PENNSYLVANIA.

WRENCH.

Specification of Letters Patent No. 14,528, dated March 25, 1856.

T0 all whom t may concern:

Be it known that I, l/VILLIAM I/VARWICK, of Pittsburgh, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Screw- VVrenches; and I do hereby declare that thefollowing is a full, clear, and exact description of the construction ofthe same, reference being had to the annexed drawings, forming part ofthis specification, in which- Figure l is a side view; Fig. 2 a frontView; Fig. 3 a transverse section through the lines I-II of Figs. 1 and2; and Fig. L a perspective view of the spring pawl D.

In all the figures the same letters refer to like parts.

A is the shank; B the stationary of the shape of a hammer, cast in onepiece with the shank.

C is the sliding aw D a spring pawl, with the thumb piece a; b thespring of the pawl; it is fastened to the same by being inserted into acut at the upper end of the pawl, and secured there by a pin or rivet c.

E is the handle made of wood.

The shank A is recessed, and the side el, d, of the recess is toothed,forming a rack; the other side e e is smooth; the pawl (D) is placed inthe recess, inside of the sliding j aw B; its teeth f, f, catch in theteeth CZ, el, of the shank, and its spring, b bears against the side e cof the recess. When the pawl is pressed back (by operating with thefinger on the thumb piece a, as indicated in Fig. 1,) a projection g onthe pawl, strikes the side e, e, preventing hereby the spring b fromgetting overstrained; the sliding jaw C may be setI to any distance fromthe stationary jaw B, corresponding with the size of a screwhead or nuton which the wrench is to be applied. The sliding aw can be set howeveronly in so many positions as correspond with the number of the teeth CZ;the closer the latter are spaced the smaller changes can be made in theposition of t-he jaws; as this is the casein all screw-wrenches withrack arrangement 79 is the pivot of the pawl; it turns in the pivot holein the sliding jaw C, and is kept by it in its place.

The advantagesin the described wrench are, that it is easy got up, andnot liable to get out of order, as the pawl is well protected by beingplaced inside of the sliding` j aw in the recess in the shank A; andthat the sliding jaw can be set into any position in a fast and easymanner. In the described wrench I do not claim the rack, nor do I claimthe applying of a spring pawl, as t-hese devices have been `used beforeand are well known, but

` Vhat I claim herein as new and desire to secure by Letters Patent is:

Providing the shank A with a recess, whose one side Z (Z is toothed, andthe other e e is smooth, in combination with a pawl D placed into saidrecess, on the inside of the sliding jaw C, in the manner substantiallyas described.

WILLIAM WARWICK.

Vitnesses:

HENRY MOESLEY, T. B. ATTERBURY.

